What a lovely project! InsidetheBlue team has created a fish balloon that traverses in air, senses WiFi waves and displays the data on wifi through colors and images.
The Signal Fish communicates to a Brain Coral via XBee, and the Intel Galileo parses the Signal Fish data and directs it how to act. A Node.js web app allows you to take manual control of the Signal Fish using your tablet or phone, or you can let the Signal Fish autonomously explore a space on its own, showing you how it sees the world.
Check out the two videos below. One shows the Signal Fish in construction, another showing Signal Fish hunting for wifi waves and creating visuals that correspond to the data it eats. It is an ambitious project and I wonder if a home version of the project can be made by DIY enthusiasts.
There is in-depth tutorial and guidelines available on how to make one, in case you decide to go for it (go for it, go for it, go for it!). It includes XBee configuration, Rig construction and the circuit designing. Most of the circuit components are unable to work on their own and need external libraries for compilation. Below is a link to arduino’s Library with compilation guidelines.
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